When invoked, the Identity plugin will look for a service by the name or alias
Zend\Authentication\AuthenticationService in the ServiceManager.
You can provide this service to the ServiceManager in a configuration file:

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// In a configuration file...returnarray('service_manager'=>array('aliases'=>array('Zend\Authentication\AuthenticationService'=>'my_auth_service',),'invokables'=>array('my_auth_service'=>'Zend\Authentication\AuthenticationService',),),);